Seat frame



FIG. 1 is a perspective view of a seat frame showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a side elevational view, the opposite side being a mirror image thereof; and,

FIG. 4 is a rear elevational view thereof.

The views of the seat frame not shown form no part of the claimed design. The broken lines depicting arms, feet, finials, top spreader bar, supports and medallions represent environmental elements only and form no part of the claimed design. 

The ornamental design for a seat frame, as shown and described. 